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先看Spring Boot中依赖的logback,log4j,slf4j相关Jar包
1.最简单的默认打印控制台日志
import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class ImportDemoController {Logger logger= LoggerFactory.getLogger(ImportDemoController.class); @Autowired private User user; @Autowired private ImportDemo importDemo; @Autowired private User01 user01; @Autowired private UserFactoryBean userFactoryBean; @Autowired private UserLazy userLazy; @RequestMapping("/importDemo") public String demo() throws Exception { logger.info("ImportDemoController 开始>>>"); importDemo.doSomething(); user01.username = "user01"; String s = user.username; String s1 = user01.username; String s4 = userFactoryBean.getObject().username; String s5=userLazy.username; logger.info("ImportDemoController 结束<<<"); return "ImportDemo@SpringBoot " + s + " " + s1 + " " + s4+ " " + s5; }}
注意需要引入:org.slf4j相关包。
2.修改日志级别
日志级别 trace<debug<info<warn<error<fatal
默认级别为info,默认打印info及其以上级别的日志,默认不打印debug日志,
public String demo() throws Exception { logger.debug("ImportDemoController 开始>>>"); importDemo.doSomething(); user01.username = "user01"; String s = user.username; String s1 = user01.username; String s4 = userFactoryBean.getObject().username; String s5=userLazy.username; logger.debug("ImportDemoController 结束<<<"); return "ImportDemo@SpringBoot " + s + " " + s1 + " " + s4+ " " + s5; }
修改Spring Boot配置文件即可打印debug日志
application.properties
logging.level.root=debug
logging.level设置日志级别,后面跟生效的区域,比如root表示整个项目,也可以设置为某个包下,也可以具体到某个类名(日志级别的值不区分大小写)
logging.level.root=info就是默认的情况,你改为我上面那样就打印出debug了,开发环境打印,线上是不允许的。
3.使用logback.xml配置文件实现更精细的配置
logback.xml和application.properties放在同一层目录即可,这个logback.xml非常好,源自网络,只要简单修改存储路径和对应的包空间就可以直接在项目中使用了
${log.pattern} ${log.filePath}/debug.log ${log.filePath}/debug/debug-%d{yyyy-MM-dd}.log.gz ${log.maxHistory} ${log.pattern} debug ACCEPT DENY ${log.filePath}/info.log ${log.filePath}/info/info-%d{yyyy-MM-dd}.log.gz ${log.maxHistory} ${log.pattern} info ACCEPT DENY ${log.filePath}/error.log ${log.filePath}/error/error-%d{yyyy-MM-dd}.log.gz ${log.maxHistory} ${log.pattern} error ACCEPT DENY
我的配置是写在D盘log目录下,可以根据需要设置。
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